COMMSTRING

The COMMSTRING parameter specifies the protocol identifier and address for communication.

Description

The connection handler supports TCP/IP. The COMMSTRING value defines the protocol followed by the protocol specific information

For developing remote client applications with a TCP/IP connection handler, you need the protocol identifier TCP, followed by the IP address of the machine that the Classic data server is running on, and the port number that is assigned to this server as a listen port. For example: TCP/host-name/port-number.
The client connection string supports Internet Protocol Version 4 (IPv4) and Internet Protocol Version 6 (IPv6). For example:
```
SET,CONFIG,SERVICE=INIT,COMMSTRING='TCP/0.0.0.0/9087'; (IPv4)
SET,CONFIG,SERVICE=INIT,COMMSTRING='TCP/::/9087';         (IPv6)
```
If you try to connect to the data server by using IPv6, you might need to provide a scope if you are using a link-local address. The scope is typically the network interface name that you specify following the IPv6 address. The format is ipv6 address%scope. For example:
```
SET,CONFIG,SERVICE=INIT,COMMSTRING='TCP/fe80::xxxx:xxxx:xxxx:xxxx%INTF0001/9087';
```

Specification

Use: Configuration parameter for the connection handler service.

Service class: INIT

Service task: CACINIT

Data type: CHAR(64)

Default: TCP/0.0.0.0/9087